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Search: id:A070156
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| A070156 |
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n-1,n+1,1+n^2 and 1+n^4 are all prime numbers. |
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+0
3
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| 4, 6, 180, 3390, 18060, 19380, 34500, 92220, 92640, 96180, 114660, 127680, 133980, 140760, 159630, 161880, 172170, 207480, 254280, 255840, 263820, 296910, 309780, 378570, 380880, 397590, 408690, 422880, 432660, 440550, 511170, 540390, 572940
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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n=6: 5,7,37,1297 are all primes
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MATHEMATICA
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Do[s=n; If[PrimeQ[n-1]&&PrimeQ[n+1]&&PrimeQ[1+n^2] &&PrimeQ[1+n^4], Print[n]], {n, 1, 1000000}]
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CROSSREFS
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Cf. A001359, A070155.
Sequence in context: A137025 A070155 A074124 this_sequence A081970 A076098 A141568
Adjacent sequences: A070153 A070154 A070155 this_sequence A070157 A070158 A070159
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KEYWORD
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easy,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Apr 23 2002
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